Scale



NOV. 13, 1945. Mv THQRSSQN 2,389,108

SCALE Filed Sept. 2-3, 1942 2 Sheets-Sheet 2 ATTORNEYS Patented Nov. 13, 19.45

UNITED STATES PATENT OFFICE 1 Claim. (Cl. 265-68) This invention relates to weighing scales of high capacity and more particularly to such weighing scales in which a pointer is moved over a graduated dial by means of a spring counterbalanced rack in proportion to the load on the scale, although not so limited.

One object of the present invention is a scale having a minimum movement of the beam lever.

Another object of the invention is a spring dial scale in which the elongation of the spring is reduced to a minimum.

It is also an object of the invention to attain maximum movement of the indicator actuating rack for greatest possible ease in calibrating.

its other end, by knife edges 30, on a frame 32 depending from the frame member I.

To assure proper meshing of the teeth of the rack 24 with the teeth of the pinion 22, a guide is provided in the form of a sleeve 31 mounted on the end of a threaded stud 33 which passes freely through a bracket 34 on the scale housing and carries a nut, as shown. Rack arm 28 carries knife edges 35 supporting the upper end of the rod 35 connecting the rack arm 28 with the tare beam 38 which which the steelyard rod 40 extends to the platform lever system and on which are carried beams 31 for the usual sliding poises (not shown). The tare beam 38 may carry the fi i z g ggfig gf g z fg zg a conventional counterweight or ball 39 to alter its e e e 0 welg center of gravity. when out of level, with the smallest possible error. Rack arm 28 is formed intermediate its ends Still another object of the invention is a scale with a Sadd1e carrying portion comprising the .con.struction in.whichithe vertical center of grav' upwardly extending portion 42, bridge portion 43 f if gp i gi Y i and the downwardly extending vertical arm 54. tantra on g a c saddle 44 which as a por ion ex en mg un erw At one end saddle 44 is slotted to receive a 00 g w i g ig gg i g w screw 46 and at the other end it carries a bolt 2. 52 55 g i g ggi g :Z 2 f of 48 by which its position relative to the kl'acktalila f th loc nu s the scale of this invention above the scale platgig gi g g fi g g aeknife edge 59 gfghggg bemg broken away m the Interest of whose location along the rack arm can be ad- Figure 2 is a view in perspective showing the Justed by movfemem'i of E i i a gq pl tf and associated mechanism; and end of the vertical arm 5 s aper ure 0 1e e ve Figure 3 is an enlarged view'of the rack arm the threaded end of an adlustable rack arm end and its associated parts portion 58 which may be adJustably fixed 1n posi- Figure 4 is a perspective view of the rack arm non by 9 nuts 56 and and associated parts The knife edge 59 of the rack arm 28, shown Referring first to Figure 1, a dial housing, which m an enlarged View 3 3, 1S suppolted m may be representative of any convenient housa 100p Stump 69 Whlch 1S susp ended on the ing or support for the scale mechanism, is indiend of 0011 Sprlng 5 Se ured at its upper end cated at 5. Extending between opposite sides of to a splmg clamp Whlch Sprmg clamp the dial housing 5 is a frame member I forked ab1y Q by means of a bearmg 55 as at 9, II] at its ends and provided with set earned 111 a @1113 bearmg 67 on a l screws [2 to permit levelling or other adjustment Justably PI O tEd by a threaded connection and of the frame m b ith respect, t supporting lock nut with the rod 69 which is th1 eaded into bosses [4 a i d by th frame 5 the frame I and secured in adJusted position by o t frame member 1 is rotatably mounted, the lock nuts 70 and il. This construction facilas in bearings, an arbo Is on hi i carried itates calibration of the scale in that it is simply the hand or pointer, a fragmentary portion f necessary to loosen locl; screw 46 and turn the the end of which is indicated at I8. Rotation of nuts and 52 and adlust the saddle 44 l nelthe arbor, as will be understood, causes the point- 50 tlldlnally- Further o d l t ent 0f er to travel over the di l 20, the rack arm 28 in order that the rod 23 be Arbor I6 carries a pinion 22 in mesh with the vertical may be effected by nuts 56 and 51. Again rack 24. The rack is carried on the upper end by adjustingthe nuts 10 and ll,efiect1ng a change of a vertically disposed rod 25 connected to the in vertical distance from frame 1 of the loop 60,

free end of a rack arm 28 which is pivoted at the position of the indicator may be changed.

the conventional zero adjustment l1. Raising or lowering the ball 13 will offset errors arising from tilting the scale to the right and left. A second adjustable ball 19 on the platform lever 80 at a selected point between the fulcrum 8| of this lever and the stirrup 83 of the steelyard rod 43 will appended claim.

What is claimed is:

In a scale of the character described, a frame, an arbor rotatably mounted on the frame, a pinion carried by the arbor, a rack arm, a rack connected thereto and meshing with the pinion,

counteract errors caused by tilting the scale to r the front or back.

It will thus be seen that a scale construction has been provided in which the rack is capable of alignment in all directions to assure perfect meshing of the teeth. Furthermore, the rack said rack arm comprising a bridge portion and end portions, one of said end portions being pivotally mounted at one end on the frame and at its other end joining with an upwardly extending arm portion joined to one end of said bridge portion, the other end of said bridge portion being provided with securing means for an adjusting bolt and a downwardly extending portion, a saddle slidable along said bridge portion, means to secure one end of said saddle to the rack arm, an adjusting bolt connected to the other end of the saddle and adapted to cooperate with said securing means to position said saddle, the other end portion comprising a threaded portion received in said downwardly extending portion, and lock nuts on said threaded portion to adjustably secure said other end portion and the downwardly extending portion together.

MATTHEW THORSSON. 

